A childhood belief about afterlife

This is actually one of my earlier memories so it's a little hazy but parts of it are still quite vivid.
I remember being in Sunday School and this woman whose child care certificate must have been made of construction paper and glitter, was speaking to the congregation of youngsters about the difference between Heaven and Hell.
I have from as far back as I can remember struggled with the concept of living forever.(Either way I look at it living for an eternity in either case is Hell in itself.)
This woman had me believing that when you die and go to heaven (because we were all good little girls and boys.) you eternally sit on a fence and listen to angels sing.
Right then and there I decided that Christianity wasn't for me, her story sent me into my earliest memory of an anxiety attack and I bolted for the exit as soon as I saw an opportunity.
This is where things get hazy, I remember construction workers and a bunch of adults I didn't recognize. I was found and my parents promptly took me home.
I must have been at least 2, but it's hard to know for sure.